linux-kernel - Re: [PATCH] phy: qcom-qmp-pcie: Fix the SM8450 PCS registers

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Date:   Wed, 21 Sep 2022 16:06:10 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        vkoul@...nel.org, andersson@...nel.org
Cc:     kishon@...com, linux-arm-msm@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: qcom-qmp-pcie: Fix the SM8450 PCS registers

On 10/09/2022 09:38, Manivannan Sadhasivam wrote:
> In the PCS region, registers QPHY_V5_PCS_EQ_CONFIG4 and
> QPHY_V5_PCS_EQ_CONFIG5 should be used instead of QPHY_V5_PCS_EQ_CONFIG2
> and QPHY_V5_PCS_EQ_CONFIG3.
> 
> This causes high latency when ASPM is enabled, so fix it!

I have checked against vendor's tree [1]. The registers in question have 
offsets 0x01c0f3e0 / 0x01c0f3e4. The sm8450.dtsi uses 0x1c0f200 as the 
PCS region base for the PCIe PHY1. Thus the correct offsets for the 
table are 0x1e0/0x1e4.

There might be a mistake in the name of the register, but the address 
corresponds to the address in the vendor's tree.

[1] 
https://github.com/MiCode/kernel_devicetree/blob/zeus-s-oss/qcom/waipio-pcie.dtsi#L520

> 
> Fixes: 2c91bf6bf290 ("phy: qcom-qmp: Add SM8450 PCIe1 PHY support")
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>   drivers/phy/qualcomm/phy-qcom-qmp-pcie.c   | 4 ++--
>   drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h | 4 ++--
>   2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> index 4648467d5cac..b508903d77d0 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> @@ -1332,8 +1332,8 @@ static const struct qmp_phy_init_tbl sm8450_qmp_gen4x2_pcie_rx_tbl[] = {
>   };
>   
>   static const struct qmp_phy_init_tbl sm8450_qmp_gen4x2_pcie_pcs_tbl[] = {
> -	QMP_PHY_INIT_CFG(QPHY_V5_PCS_EQ_CONFIG2, 0x16),
> -	QMP_PHY_INIT_CFG(QPHY_V5_PCS_EQ_CONFIG3, 0x22),
> +	QMP_PHY_INIT_CFG(QPHY_V5_PCS_EQ_CONFIG4, 0x16),
> +	QMP_PHY_INIT_CFG(QPHY_V5_PCS_EQ_CONFIG5, 0x22),
>   	QMP_PHY_INIT_CFG(QPHY_V5_PCS_G3S2_PRE_GAIN, 0x2e),
>   	QMP_PHY_INIT_CFG(QPHY_V5_PCS_RX_SIGDET_LVL, 0x99),
>   };
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h b/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h
> index 61a44519f969..cca6455ec98c 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcs-v5.h
> @@ -11,7 +11,7 @@
>   #define QPHY_V5_PCS_G3S2_PRE_GAIN			0x170
>   #define QPHY_V5_PCS_RX_SIGDET_LVL			0x188
>   #define QPHY_V5_PCS_RATE_SLEW_CNTRL1			0x198
> -#define QPHY_V5_PCS_EQ_CONFIG2				0x1e0
> -#define QPHY_V5_PCS_EQ_CONFIG3				0x1e4
> +#define QPHY_V5_PCS_EQ_CONFIG4				0x2e0
> +#define QPHY_V5_PCS_EQ_CONFIG5				0x2e4
>   
>   #endif

-- 
With best wishes
Dmitry